SAN FRANCISCO - STARTUP Scoopler on Friday was inviting owners of Android-powered smartphones to install an application that promises to alert them every time a celebrity is sighted nearby. The free JustSpotted software was available online at the Android Market. 'There is no other application that gives you real-time alerts like this with thousands of spottings on our website every day,' Scoopler co-founder AJ Asver told AFP in an e-mail. 'If you are in a metropolitan area, you are going to be pleasantly surprised by how close you are to the celebrity world.' JustSpotted.com launched in October with an online map that pinpoints celebrity whereabouts in real time based on public updates from social networking star Facebook and microblogging service Twitter. JustSpotted members also contribute sightings. While branded by some as a potential resource for stalkers, JustSpotte...